package cn.tedu.friend;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class FriendReducer extends Reducer<Text,IntWritable,Text,IntWritable> {
    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
        int count = 0;
        for (IntWritable val: values
             ) {
            if (val.get()!=0)
                return;
            count++;
        }
        // 如果整个循环结束都没有人突然你
        // 值表示共同好友的个数
        context.write(key,new IntWritable(count));
    }
}
